A Wide Load Range ZVS Push-Pull DC/DC Converter with Active-Clamped

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A Wide Load Range ZVS Push-Pull DC/DC
Converter with Active-Clamped
Introduction:
Currently, most electrical equipments are designed with the focus
on isolation, light weight, small size, high power density, and high
reliability, low cost and low electromagnetic interference (EMI) to meet
high expectations of the consumer. The push-pull converters have
attributes of simple circuitry, galvanic isolation, high-voltage conversion
ratio and better transformer utilization; also, they are widely used in
low-input-voltage applications such as uninterruptible power supply
(UPS), battery chargers, electric vehicles, fuel cell systems and
photovoltaic systems, etc. It is worth to mention that on one hand the
conventional push-pull converter suffers from high turn-off voltage
spike because of transformer leakage inductor, on the other hand, the
hard-switched results in the amount of switching losses. Besides, the
problem of EMI will be serious when the switching frequency is higher.
As a consequence, the conventional push-pull converter is unable to
meet aforesaid requirements because of high switch stress, high
switching losses and the problem of EMI. In order to fulfill the above
said demand and overcome the aforementioned limitations, many zero
voltage switching (ZVS) and zero current switching (ZCS) topologies
have been proposed and developed. The soft-switching converter
switches can be controlled to be at zero or near zero at the moment of
switching. Such operation principle is usually achieved by making use of

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series resonance phenomenon, parallel resonance phenomenon and
series–parallel resonance phenomenon that occur between dedicated
components or parasitic elements in the converter circuit itself.
Existing system:
The proposed active-clamped push-pull converter solves the
discharge problem of the clamping capacitor and can feedback energy of
the clamping capacitor to output. However, this converter adds too many
power devices. The active power switches of the converters are located
both on the primary and secondary sides of the high transformer and all
of the active switches can achieve ZVS. However, the complicated
driver circuits are needed and the cost is high. The three-phase push-pull
converters with active-clamp circuits also increase the driving
complexity and associated cost. The topology adds two active clamping
circuits to recycle leakage energy at the primary side of high transformer
and the clamping switches can also realize ZVS.

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Drawbacks:
 But the components stress imposed on the clamping switches are
greater than twice the input voltage.
 High switch-voltage-stress and hard-switching.
Proposed system:
A new ZVS push-pull converter with active-clamped has been
presented in this paper. All of three switches can achieve ZVS turn-on in
a wide load range, which is to reduce the switching losses and increase
the transfer efficiency. The voltage across switch can be clamped at a
lower level which is much less than that enabling the use of lower-
voltage, lower-performance and lower cost devices. Besides, the
problems of flux-imbalance existing in the conventional push-pull
converter can be eliminated and the energy stored in the leakage
inductor can be recycled.

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Advantages:
 Simple topology.
 High-efficiency.
 High-performance and galvanic isolation.
 Reduce the switching losses.
 Increase the transfer efficiency.
Applications:
 Battery and super-capacitor source applications.

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Block diagram:
Input DC
Supply
Half Bridge Inverter
With Active Clamping circuit
High frequency Multi-
winding Transformer
Full Bridge
Diode
Rectifier
Filter
Load
Isolation Circuit12V DC
5V DC
Buffer Circuit
Micro Controller
Circuit

A Wide Load Range ZVS Push-Pull DC/DC Converter with Active-Clamped

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A Wide Load Range ZVS Push-Pull DC/DC Converter with Active-Clamped